Nivea Serrao
March 03, 2017 AT 03:00 PM EST

When Catherine Zeta-Jones was doing research for her part on Feud: Bette and Joan, she had an excellent resource she could call on for advice: her father-in-law Kirk Douglas.

The actress plays Olivia de Havilland in the Ryan Murphy anthology series which follows the relationship of movie stars Joan Crawford and Bette Davis (played by Jessica Lange and Susan Sarandon) as they made Whatever Happened to Baby Jane? — a film that is now regarded as a cult classic.

As Zeta-Jones noted during a SiriusXM town hall discussion with PEOPLE and Entertainment Weekly editorial director Jess Cagle, her father-in-law is only six months younger than de Havilland, with both actors turned 100 within a short period of each other.

RELATED: First Look Photos at Feud: Bette and Joan

“He went, ‘Aaah Olivia’ and said nothing else,” says Zeta-Jones of when she told Douglas about who she’d be playing on the show. “I said, ‘And it’s about Joan Crawford and Bette Davis.’ And he went ‘Joan Crawford? She was out of her effing mind.”

“And then about Bette Davis, he went ‘Aww, she was a broad. She told it as it was,” laughs Zeta-Jones. “It sums up in one cup of tea, exactly where these women were coming from.”

See the clip above, and watch Cagle’s full town hall interview with the cast of Feud, streaming now on PEOPLE/Entertainment Weekly Network at PEOPLE.com/PEN, or download the app on mobile or connected devices. You can also listen to the full interview on EW Radio (SiriusXM ch. 105) all this week.

Feud premieres Sunday at 10 p.m. ET on FX.

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